Politics. No one’s tired of that yet, right? Ha. Ha. Ha. Yeah. So, in “Candidate for Crime,” Jackie Cooper is Nelson Hayward, a US Senate candidate who’s sick and tired of his campaign manager telling him what to do. Does he fire him? Nope, it’s a literal Saturday Night Massacre, as the pol kills him in cold blood, then tries to pin it on a mob assassination attempt. Of course, Columbo doesn’t buy this angle for a minute and engages in a one-man filibuster against…. murder. JD Ryznar (Beyond Yacht Rock) returns to the program to talk about the (rather uneven) episode, Dixieland…